Branching ratios for the dissociative recombination of hydrocarbon ions

Angelova, G. V.; Novotný, Oldřich; Mitchell, James B.; Rebrion-Rowe, C.; Garrec, Jean-Luc Le; Bluhme, H.; Svendsen, Annette; Andersen, Lars H.

doi:10.1016/j.ijms.2004.03.002

Cited by 29 publications

(26 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This table replaces Table VIII of the original database [8]. are in accordance with the experimental finding in [41] that the total branching ratio of all C2-containing channels is 0.78, and that for CX+CY+... channels is 0.22. However, for the individual channels the suggested branching ratios within these two groups are fairly uncertain and are determined following the trends of RDR in other CH [42,43].…”

Section: Dr For Ethane Familysupporting

confidence: 84%

Hydrocarbon Collision Cross Sections for Magnetic Fusion: The Methane, Ethane and Propane Families

Reiter

Janev

2010

Contrib. Plasma Phys.

View full text Add to dashboard Cite

Kinetic analysis of the behaviour of hydrocarbons in fusion plasmas requires knowledge of cross sections for their most relevant collision processes. Upgrades and extensions of the commonly used HYDKIN (HYDride KINetics) online cross section database (based on compilations in 2002) and its data analysis toolbox for collisions of hydrocarbons with electrons and protons in relevant fusion plasma conditions are presented. Newly identified channels for dissociative recombination provide strongly reduced D/XB ratios for Gerö-Band spectroscopy at low temperatures compared to earlier results, in accordance with experimental findings.

show abstract

Section: Dr For Ethane Familysupporting

confidence: 84%

Hydrocarbon Collision Cross Sections for Magnetic Fusion: The Methane, Ethane and Propane Families

Reiter

Janev

2010

Contrib. Plasma Phys.

View full text Add to dashboard Cite

show abstract

“…At low pressure (Fahr et al 1999, Stoliarov et al 2000, Hébrard et al 2013, Thorn et al 2000 → Rate constant in the 10-50K deduced from (Sabbah et al 2007), branching ratio mainly from (Savee et al 2012) (see also (Knyazev et al 1992, Cavallotti et al 2014, Leonori et al 2015 35.! 86.7 % de C 3 H x (supposed to be C 3 H 4 **) and 13.3% of CH x + C 2 H y (Angelova et al 2004a, Angelova et al 2004b. We supposed than C 3 H 4 ** leads mainly to C 3 H 3 by comparison with C 3 H 4 photodissociation (Seki & Okabe 1992, Ni et al 1999, Harich et al 2000a, Harich et al 2000b.…”

Section: Review Of the Gas Phase Reactionsmentioning

confidence: 85%

Methylacetylene (CH3CCH) and propene (C3H6) formation in cold dense clouds: A case of dust grain chemistry

Hickson

Wakelam

Loison

2016

Molecular Astrophysics

View full text Add to dashboard Cite

show abstract

“…We do not report on C 2 H + and C + 4 because OSU-01-2007 used experimental DR-BR (Ehlerding et al 2004;Heber et al 2006). For C 3 H + , in spite of existing partial measurements (Angelova et al 2004b), the OSU-01-2007 database uses the same probability for the emission of C or H. Although Leung et al (1984) assumed 100% of H emission, equiprobability was proposed by Millar et al (1988), based on more detailed calculations. The HVC-SUBR are indeed between these two extreme situations.…”

Section: New Brs For Astrochemistry Databasesmentioning

confidence: 99%

Statistical universal branching ratios for cosmic ray dissociation, photodissociation, and dissociative recombination of the C, CH and C₃H₂neutral and cationic species

Chabot

Tuna

Béroff

et al. 2010

A&A

View full text Add to dashboard Cite

Context. Fragmentation-branching ratios of electronically excited molecular species are of first importance for the modeling of gas phase interstellar chemistry. Despite experimental and theoretical efforts that have been done during the last two decades there is still a strong lack of detailed information on those quantities for many molecules such as C n , C n H or C 3 H 2 . Aims. Our aim is to provide astrochemical databases with more realistic branching ratios for C n (n = 2 to 10), C n H (n = 2 to 4), and C 3 H 2 molecules that are electronically excited either by dissociative recombination, photodissociation, or cosmic ray processes, when no detailed calculations or measurements exist in literature. Methods. High velocity collision in an inverse kinematics scheme was used to measure the complete fragmentation pattern of electronically excited C n (n = 2 to 10), C n H (n = 2 to 4), and C 3 H 2 molecules. Branching ratios of dissociation where deduced from those experiments. The full set of branching ratios was used as a new input in chemical models and branching ratio modification effects observed in astrochemical networks that describe the dense cold Taurus Molecular Cloud-1 and the photon dominated Horse Head region. Results. The comparison between the branching ratios obtained in this work and other types of experiments showed a good agreement. It was interpreted as the signature of a statistical behavior of the fragmentation. The branching ratios we obtained lead to an increase of the C 3 production together with a larger dispersion of the daughter fragments. The introduction of these new values in the photon dominated region model of the Horse Head nebula increases the abundance of C 3 and C 3 H, but reduces the abundances of the larger C n and hydrocarbons at a visual extinction A V smaller than 4. Conclusions. We recommend astrochemists to use these new branching ratios. The data published here have been added to the online database KIDA (KInetic Database for Astrochemistry, http://kida.obs.u-bordeaux1.fr).

show abstract

Branching ratios for the dissociative recombination of hydrocarbon ions

Cited by 29 publications

References 48 publications

Hydrocarbon Collision Cross Sections for Magnetic Fusion: The Methane, Ethane and Propane Families

Hydrocarbon Collision Cross Sections for Magnetic Fusion: The Methane, Ethane and Propane Families

Methylacetylene (CH3CCH) and propene (C3H6) formation in cold dense clouds: A case of dust grain chemistry

Statistical universal branching ratios for cosmic ray dissociation, photodissociation, and dissociative recombination of the C, CH and C₃H₂neutral and cationic species

Contact Info

Product

Resources

About

Branching ratios for the dissociative recombination of hydrocarbon ions

Cited by 29 publications

References 48 publications

Hydrocarbon Collision Cross Sections for Magnetic Fusion: The Methane, Ethane and Propane Families

Hydrocarbon Collision Cross Sections for Magnetic Fusion: The Methane, Ethane and Propane Families

Methylacetylene (CH3CCH) and propene (C3H6) formation in cold dense clouds: A case of dust grain chemistry

Statistical universal branching ratios for cosmic ray dissociation, photodissociation, and dissociative recombination of the C, CH and C3H2neutral and cationic species

Contact Info

Product

Resources

About

Statistical universal branching ratios for cosmic ray dissociation, photodissociation, and dissociative recombination of the C, CH and C₃H₂neutral and cationic species